Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 14-16

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 37-39

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 39-41

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 41-42

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 51-52

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 80-86

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 198-203

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 207-209

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 209-212

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 213-221

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 222-223

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 223-236

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 249-251

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Published in Journal of the Washington Academy of Sciences, in 1931, in volume 21, pages 251-253

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 259-261

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 262-263

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 288-294

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 298-301

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 301-304

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 305-308

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 309-314

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 320-325

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 336-339

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 354-355

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 390-397

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 397-405

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 405-407

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 416-426

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 427-429

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 430-436

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 436-437

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 482-483

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Published in Jour Washington Acad Sci, in 1931, in volume 21, pages 513-526

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 526-530

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 530-535

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 536-538

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, pages 539-640

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, issue 4, pages 49-51

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, issue 7, pages 144-152

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, issue 12, pages 264-276

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, issue 14, pages 325-336

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Published in Journal of The Washington Academy of Sciences, in 1931, in volume 21, issue 15, pages 347-353

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Published in Journal of the Washington Academy of Sciences, in 1931, in volume 21, issue 20, pages 485-488

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